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Retirement Benefits (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 30, 2022 | Dec. 31, 2021 | Dec. 25, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |
Non-service pension cost included in non-operating expense | $ 1,000 | $ 12,000 | $ 5,000
Pension Benefits |  |  |
Components of net periodic benefit cost |  |  |
Service cost-benefits earned during the period | 8,242 | 9,355 | 9,361
Interest cost on projected benefit obligation | 10,996 | 11,409 | 13,313
Expected return on assets | (19,754) | (20,767) | (18,814)
Amortization of prior service cost (credit) | 84 | 246 | 294
Amortization of net loss (gain) | 4,701 | 9,248 | 10,243
Settlement loss (gain) | 0 | 12,285 | 0
Cost of pension plans which are not significant and have not adopted ASC 715 | 284 | 368 | 168
Net periodic benefit cost | 4,553 | 22,144 | 14,565
Postretirement Medical Benefits |  |  |
Components of net periodic benefit cost |  |  |
Service cost-benefits earned during the period | 516 | 670 | 609
Interest cost on projected benefit obligation | 839 | 832 | 1,016
Expected return on assets | 0 | 0 | 0
Amortization of prior service cost (credit) | 0 | 0 | 0
Amortization of net loss (gain) | 345 | 1,002 | 733
Settlement loss (gain) | 0 | 0 | 0
Net periodic benefit cost | $ 1,700 | $ 2,504 | $ 2,358

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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